Pneumatic tool.



' No. 692,799. Patented Feb. 4, |902.

. w. H. snLEY. f

PNEUMATIG TOOL. (Application med .rune 1'5, 1900.)

mol Model.)

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W/TNESSES A nom/5y f UNITED vSTATES PATENTOFPICE. v

WILLIAM H. soLEY, OE PHILADELPHIA, PENNSYLVANIA, ASsIGNOR OE ONE- HALF TO GEORGE A. DALLETT, OE PHILADELPHIA, PENNSYLVANIA, AND THOMAs H. DALLETT, OF OHEYNEY, PENNSYLVANIA, TRADING As THOMAS H. DALLETT a COMPANY. i

PN Eu NIA-ric, Tool..

SPECIFICATION forming' part of Letters Patent No. 692,799, dated February 4, 1902.

Application led June 15, 1900. Serial No. 20,417. (No model.)

T @u M7107 t "my 0070067711: l the casing to the exterior thereof. In the pis- 5o Be it known that I, WILLIAM H. SOLEY, a ton B is the annular groove h2, and extending citizen of the United States, residingat Philafrom the piston-chamber A through the casdelphia, county of Philadelphia, and State of ing A are the ports F and G. There is also Pennsylvania,have invented anew and useful a passage H connecting the piston-chamber Improvement in Pneumatic Tools, of which opposite the port F with the Valve-chamber thefollowingis afull, clear, and exact descrip- D, beneath the valve-piston d4. tion, reference being had to the accompany- In the position of the parts shown inl Figs. ing drawings, which form apart of this speci- 2 and 3 the valve D is in such posi-tion that Io fication. the inlet-port cl2 is closed While the exhaust- My invention relates to certain improvep ort cl3 is in connection with the4 passage vF. 6o ments in that class of tools used for cutting, The air above in,v piston-chamber A above chipping, and the like, generally known as the piston exhausts'through the chamber D2,

pneumatic tools, and has for its object to port d3, and passage F. The constant sup- 15 provide means and mechanism to make the ply of air-pressure below the piston-head eletool more simple in construction and effective vates the piston until` the annular groove in operation. l beneath the shoulder of piston B registers To that end it consists in certain improvewith the passage E, at which time air will be ments in construction to obtain this result, admitted from thel source of constant preszo all of which will more clearly appearin the sure beneath the piston-head to the valvedrawings and specification. chamber, beneath valve-piston d4. Thisipor- 7o.

In the drawings,Figurelisasection through tion of thevalve being ofgreater area than the tool on the line l 1 of Fig. 2. Figs.. 2 and the end subject to constant air-pressure, the f 3 are sections on the lines 2 2 and 3 3 of Fig. l. valve D will rise, covering the exhaust-port z 5 Fig. 4 is a Section on the line 4 4 of Fig. 2. cl3 and opening the inlet-port cl2 to the source A is the chamber formed in the casing A', of pressure. Air will then enter through this 75 4having at different points greater and lesser port to the chamber D2 and thence to the pisareas. In this chamber is placed the piston ton-chamber, above the piston-head. The B, having the head portion b with shoulder b', upper side of piston-head being oi' greater 3o so that the piston-head is of differential Varea area, the piston will now descend', the air beon opposite sides. From a source of pressurelow the piston exhausting through passages 8o supplythrough the passage() airis constantly Gr after the piston B has moved down suilisupplied to the chamber A beneath the pisciently to close passage E and bring annuton-head to the surface of lesser area. lar groove b2 in connection with passage H. a

3 5 D is a valve-chamber formed in the upper Under these conditions live air no longer enportion of the casing. This valve-chamber ters the Valve-chamber beneath the valve, has an enlarged portion. In this valve-chamand the air from the valve-chamber at that ber is placed a valve D', having the valvepoint exhausts out through the passage H, piston d4 resting in the enlarged partei ofthe annular groove b2, and port F. The air- 4o valve-chamber. The upper end of the valvepressure above the valve forces the Valve chamber Dis in constant communication with down until the inlet-'port d2 is closed andthe 9o the source of pressure-supply. The valve D exhaustpost cl3 opened. At this time the is also bored out to form the annular champarts are again in the initially-described pober D2, open to the top of piston-chamber A, sition and the piston ready to rise. The

45 and through the surfaceof this valve D', convalve D has the annular grooves d5 and d6.

necting with the chamber D2, are the `ports d2 In these annular grooves ber is forced. This 9 5 d3. The passage E connects the piston-chamfiber cushions the blow of the Valve in each berAand the valve-chamber D. There is also direction of movement. f apassageF from this valve-chamber through The lower portion of the piston B iS counterbored, as at I, and in this is placed the striker K.

Having now fully described my invention, what I claim, and desire to protect by Letters Patent, is-A- l. In a pneumatic tool, in combination with a casing, a piston-chamber formed in said casing, a piston of differential area in said chamber, a source of pressure-supply, a constant communication between said source of pressure-supply and the lesser piston area,a valvechamber, a valve in said chamber having a closed end, constantly acted on by the pressure-supply, and a chambered portion communicating with the piston-chamber, a piston for said valve, a passage leading from said Valve-chamber to the piston-chamber and adapted in the reciprocation of the piston t0 be covered by the piston and open into the chamber below the piston-ports in said valve, connecting with the chambered portion of the valve, one port adapted in the movement of the valve in one direction to register With an exhaust-passage and the other port in the reciprocation of the valve in the other direction adapted to register with the aira supply.

2. ln a pneumatic tool in combination with a casing, a piston -chamber formed in said casing, a piston of dierential area in said chamber, a source of pressuresupply, a constant communication between said source of pressure-supply and the lesserpiston area,a valve chamber, a valve in said chamber having a closed end, constantly acted'on by the pressure-supply, and a chambered portion communicating with the piston-chamber, a piston forsaid valve, a passage leading from said valve-chamber to the piston-chamber and adapted in the reciprocation of the piston to be covered by the piston and open into the chamber below the piston-ports in said valve connecting with the chambered portion of the valve, one port adapted in the movement of the valve in one direction to register with an exhaust-passage and the port in the reciprocation of the valve in the other direction adapted to register with the air-supply, an annular groove b2 in the piston, a port F extending through the casing to the pistonchamber and a passage H. extending from the valve-chamber to the pistonchamber opposite port F.

3. In a pneumatic tool of the character described, a source of pressure-supply, a piston and piston-chamber,a valve-chamber, a valve having a closed end in communication at that end with the pressure-supply at all times and an open end in communication with the piston-chamber at all times, ports and passages connecting the open end of the valve with the exhaust and pressure-supply.

4. In a pneumatic tool of the characterdescribed, a source of pressureLsupply, a piston and a piston-chamber, a valve-chamber, a valve having a closed end in communication at that end with the pressure-supply at all times and an open end in communication with the piston-chamber at all times, ports and passages connecting the open end of the Valve with the exhaust and pressure-supply, and a piston for said valve, ports and passages controlled by themain piston adapted to connect the valve-piston portion of the valve-chamber with the pressure-supply and exhaust.

In testimony of which invention I have hereunto set my hand, at Philadelphia, on this 12th day of June, 1900.

WVILLIAM II. SOLEY. lVitnesses:

M. F. ELLIS, J. M. SHINDLER, Jr. 

